Workout

Warm up (600)
6  x 100 choice
...rest 10 sec.

Set (450)
3 rounds
3 x 50 on 1:00
...50 kick, 50 drill, 50 swim

Set (450)
3 x 150 on 2:15
...breathing 3/5/7 by 50

Set (2000)
(150, 125) x 4 rounds, all on 2:00
(125, 100) x 4 rounds, all on 1:40

Cool down (200)
200 choice